A study from the University of Colorado at Denver found that those are the most common reasons people choose to "defriend" others on Facebook. The Boulder Daily Camera reported the study Sunday. It was conducted by doctoral student Christopher Sibona, who surveyed more than 1,500 people about why they choose to sever ties with friends, at least in cyberspace.

Sibona’s research is expected to be published by the Hawaii International Conference on System Sciences in January. Sibona found that posting crude or racists comments was the third most common reason for being defriended.